The Thrace Basin, NW Turkey, is one of the most important basins in Turkey in terms of hydrocarbon potential. Previous studies, starting in the 1930s, focused on tectonics, basin evolution, sedimentation and stratigraphy, depositional systems, and hydrocarbon potential. Eocene turbiditic sandstones and reefal limestones, and Oligocene deltaic sandstones are the major reservoir targets in the basin today. The focus of this research is the Upper Oligocene deltaic sandstones, namely the Danismen and Osmancik formations, which contain potential hydrocarbon reservoirs. The aims of research were to develop a better understanding of the geometric configuration of the Oligocene strata and to identify potential reservoirs within the study area. Accordingly, the geometric configurations of the strata were delineated using 3D seismic reflection data whereas petro-physical properties of the target formations were determined using wireline logs from three wells. A right-lateral strike slip or reverse fault system and associated NW-SE trending asymmetric fold extend across the study area. Both the fault system and the fold are truncated beneath the Miocene unconformity and are thus dated as late Oligocene to early Miocene in age. The Miocene unconformity forms a stratigraphic trap whereas the fault system and associated fold construct a NW-SE trending structural trap. Hydrocarbon-bearing, five main clean sandstone (shale volume less than %10) intervals were identified using wireline logs and evaluated as potential targets. Hydrocarbon concentrations increase through the fold structure. Thus, the fault system and the associated asymmetric fold were the main factors that affected the zonal distribution of hydrocarbons in the study area. / Master of Science / Thrace Basin, northwest part of Turkey, is one of the most important basins in Turkey in terms of oil and gas potential. Previous studies started in1930s and included studies on the geology of the basin. Major reservoir targets in the basin today are Eocene turbiditic sandstones and reefal limestones, and Oligocene deltaic sandstones. This study focuses on the Oligocene deltaic sandstones of the Danismen and Osmancik formations, which are significant in terms of the oil and gas potential in the basin. The main purpose of this thesis is to evaluate the geometric configurations of these two formations and to identify potential reservoirs within the study area. For this purpose, geometric representation of the study area was generated by mapping the formations with the help of 3D seismic data. Reservoir characteristics related to physical properties were determined by utilizing the data obtained from three wells within the study area. As a result, potential reservoir zones are discovered mainly in the Danismen Formation, which can further be incorporated with exploration activities in the basin.
| Identifer | oai:union.ndltd.org:VTETD/oai:vtechworks.lib.vt.edu:10919/73651 |
| Date | 09 December 2016 |
| Creators | Diyarbakirli, Ali Can |
| Contributors | Geosciences, Romans, Brian W., Eriksson, Kenneth A., Law, Richard D. |
| Publisher | Virginia Tech |
| Source Sets | Virginia Tech Theses and Dissertation |
| Detected Language | English |
| Type | Thesis |
| Format | ETD, application/pdf |
| Rights | In Copyright, http://rightsstatements.org/vocab/InC/1.0/ |
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